Prosody X PCI Express R1 Card – Installation Guide
Trunk cable pinout
The 8-contact RJ48C Telephone Modular Plug on the cable between the T1 interface
socket and the network must be wired as follows:
Pin
Signal
Function
Direction
4 LTT Transmit
(tip) output
5 LTR Transmit
(ring) output
1 LRT Receive
(tip) input
2 LRR Receive
(ring) input
RJ48C connector
The cable and plug must be shielded types to ensure EMC compliance.
If a cable is to be produced to wire into a network trunk connection, the connector on
the network end of the cable must be wired as appropriate for the network terminating
unit or Channel Service Unit (CSU) provided.
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